CASE.—Private Peter W——, jr.​, Co. F, 126th New York Volunteers, aged 19 years, was wounded at Bristow Station, Virginia, October 14th, 1863, by a conoidal musket ball, which fractured and depressed the inferior angle of the left parietal, at its junction with the frontal bone, and penetrated the brain. He was admitted into the 2d division hospital, Alexandria, on the 15th, in a state of insensibility. His right side was paralyzed, pulse 56 and full, and the pupils were somewhat contracted. On the 16th seven pieces of bone were removed; the largest being nearly an inch square. A large quantity of sanguinolent fluid was discharged, in which appeared portions of brain matter. The next morning a discharge of a bloody, foul-smelling fluid followed, and the patient passed his urine involuntarily. On the 18th the discharge continued; the pulse became more frequent and feeble, and death occurred at two o'clock A. M., October 19th, 1863. The post-mortem revealed inflammation of the membranes over both hemispheres; also an abscess occupying the upper half of left hemisphere of the cerebrum, at the posterior part of which was found a rifle ball. The pathological specimen is No. 1739, Sect. I, A. M. M. The depressed portion measures one by one and a half inches, from which four fragments have been removed. A fissure extends diagonally across the parietal bone, from the anterior inferior to the opposite angle, and another fissure passes downward. The specimen and history are contributed by Acting Assistant Surgeon C. P. Bigelow.